Carbon-sheet holder



7 (No Model.).

' J; s. MoDONALD. CARBON SHEET HOLDER.

No. 469,748. Patented Mar. 1 1892;

UNITED STATES 1 PATENT OFFICE.

JAMES S. MCDONALD, OF CHICAGO, ILLINOIS.

'CARBON-SHEET HOLDER.

SPECIFICATION forming part of Letters Patent No. 469,748, dated March 1,1892.

Application filed December 31, 1889- Serial No. 335,547. (No model.)

To all whom it may concern:

Be it known that 1, JAMES S. MoDoNALD, a citizen of the UnitedStates,and a resident of the city of Chicago, in the county of Cook and Stateof Illinois, have invented certain new and useful Improvements inCarbon- Sheet Holders, of which the following is a specification.

This invention relates to improvements in carbon-sheet holdersdetachable from but especially designed for use in connection with booksand similar articles, and has for its prime object to have the holder ofsuch character that the carbon-sheet may be readily and quickly attachedthereto or detached therefrom, but when secured in position will befirmly held against accidental detachment.

Another object-is to avoid smudging or dirtying the leaves of the bookby the pressure of the hand While writing by having the holder readilyadjustable upon the book, so that the carbon will underlie only theportion of the sheet being written upon.

These objects are attained by the devices illustrated in theaccompanying drawings, in which- Figure 1 represents a perspective viewof a book, showing a carbon -holder applied thereto embodying myinvention; Fig. 2, a transverse vertical section taken through the bookand holder; Fig. 3, a detail plan view of the holder, and Figs. 4 and 5enlarged sections showing the manner of securing the carhon-sheets inposition.

Similar letters of reference indicate the same parts in the severalfigures of the draw- 1ngs.

- Referring by letter to the accompanying drawings, A indicates arectangular baseplate, preferably composed of thin sheet metal, to onecorner of which is pivotally secured a bent or U-shaped clamp B ofspring metal, the outer free end of which is preferably provided with asocket C, struck up therein and adaptedand arranged to receive acorresponding projection D, formed upon the base-plate when the clamp isforced down into position, straddling the upper edge of the base-plate.The carbon-sheet E, which may be of any suitable dimension, is bent overthe upper edge of the base-plate with the body thereof lying upon thebase-plate, and is secured in this position by means of the springclamping-plate B, which is forced down upon so as to embrace said sheetand plate, the upper and forward edge F thereof being slightly curved orbent outwardly from the'base-plate to avoid tearing the carbonsheet orwrinkling the same when the clamp is forced down into position. Asclearly shown in Figs. 2, 4, and 5, the lower fold or portion of theclamp B is made longer than the upper one, so that it will come againstthe edge of the body of leaves, and thus constitute a stop for limitingthe inward movement of the plate and preventing the upper fold of theclamp from engaging over the uppermost leaf of the book. XVith thisconstruction when the carbon-sheet has become worn beyond usefulness itmay be readily and quickly detached from the holder and a new sheetsubstituted in place thereof.

In practice, when a pencil is employed for writing, it is frequentlydesirable that the carbon should also make an impression upon the backof the sheet being written upon, so as to strengthen the pencilcharacters, to which end it is necessary to employ a carbonsheet coatedupon both faces thereof; but when this is not desired or apen isemployed for writing I have provided an oiled sheet G, secured to theholder in the same manner as the carbon-sheet, and which may be laidbeneath the sheet being written'upon, covering the carbon-sheet when animpression is not desired upon the back of the sheet being written upon,but which may be thrown back out of the way, as illustrated in Fig.1,Without detaching from the holder when such double impression isdesired. I may here state, however, that this oiled sheet may bedispensed with entirely, as its employment is simply a matter ofconvenience and not of necessity, especially where the semi-carbon paperis employed.

With my detachable and adjustable carbonholder itis not necessary thatthe carbonsheet shall underlie the entire surface of the sheet beingWritten upon, but only a portion thereof, and thus the pressure of thehand in writing does not come upon the carbon-sheets, so as to smudgethe manifold sheets beneath, the holder being readily slipped along theICO book as the page is filled. However, if desired, the holder may bemade the full size of the book.

I donot desire to limit myself to pivotally securing the spring-clamp tothe base-plate, for it may be made detachable therefrom, but held inposition by duplicating the socket and projection C D at the oppositeedgeof the base-plate, although the pivotal connection is preferred,because it avoids the necessity of detaching the clamp and also thedanger of loss or misplacement thereof when detached.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In a carbon-sheet holder, the combination, with the detachablebase-plate adapted to slide between the leaves of a book, of thespring-clamp embracing one edge thereof, substantially as and for thepurpose described.

2. In a carbon-sheet holder, the combination, with the detachablebase-plate adapted to slide between the leaves of a book, of thespring-clamp pivotally secured at one end to said plate, substantiallyas described.

3. In a carbon-sheet holder, the combination, with the base-plate, ofthe spring-clamp pivotally secured at one 'end thereto, and a catchdevice for the free end of said clamp, the upper forward edge of theclamp being bent or curved upwardly,substantially as and for the purposedescribed.

4. In a carbon-sheet holder, the combination, with a smooth detachablebase-plate adapted to be inserted between the leaves of the book, and aU-shaped spring-clamp pivoted near one corner of said plate andextending substantially from side to side thereof, substantially as setforth.

5. In a carbon-sheet holder, the combination, with a smooth fiatbase-plate adapted to be inserted between the leaves of a book, a clamppivoted at one end near one corner of said plate, and a catchfor,locking said clam p in place, substantially as set forth.

6. In acarbon-sheet holder, the combination, with the detachablebase-plate adapted to slide between the leaves of a book, of a Ushapedspring-clamp embracing one edge of said plate, substantially as and forthe purpose described.

7. In a carbon-sheet holder, the combination, with the base-plateadapted to be inserted between the leaves of a book, of a U-shaped clamppivoted to said base=plate so as to embrace the edge thereof,and a stopadapted to engage the edge of the book for preventing the upper fold ofthe clamp from engaging over the uppermostleaf of the book,substantially as described.

S. In a carbon-sheet holder, the combination, with the base-plateadapted to be inserted between the leaves of a book, of a U-shaped clamppivoted to said base-plate so as to embrace the edge thereof, the lowerportion or fold of said clamp beinglonger than the upper portionthereof,so as to engage the edge of the book and prevent the said upperportion from engaging over the uppermost leaf, substantially asdescribed.

JAMES S. MCDONALD. .VVitnesses:

R. (3. OMOHUNDRO, W. R. OMOHUNDRO.

